Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, USA.
Condensed Matter and Magnet Science, Materials Physics and Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, USA.
Struct Dyn. 2015 Oct 12;2(5):054501. doi: 10.1063/1.4933133. eCollection 2015 Sep.
A hallmark in the cuprate family of high-temperature superconductors is the nodal-antinodal dichotomy. In this regard, angle-resolved photoemission spectroscopy (ARPES) has proven especially powerful, providing band structure information directly in energy-momentum space. Time-resolved ARPES (trARPES) holds great promise of adding ultrafast temporal information, in an attempt to identify different interaction channels in the time domain. Previous studies of the cuprates using trARPES were handicapped by the low probing energy, which significantly limits the accessible momentum space. Using 20.15 eV, 12 fs pulses, we show for the first time the evolution of quasiparticles in the antinodal region of Bi2Sr2CaCu2O8+δ and demonstrate that non-monotonic relaxation dynamics dominates above a certain fluence threshold. The dynamics is heavily influenced by transient modification of the electron-phonon interaction and phase space restrictions, in stark contrast to the monotonic relaxation in the nodal and off-nodal regions.
高温超导铜酸盐家族的一个特点是节点-反节点二分性。在这方面，角分辨光电子能谱（ARPES）已被证明具有特别强大的功能，可直接在能量-动量空间中提供能带结构信息。时间分辨角分辨光电子能谱（trARPES）有望添加超快时间信息，试图在时域中识别不同的相互作用通道。以前使用 trARPES 对铜酸盐的研究受到探测能量低的限制，这大大限制了可访问的动量空间。我们使用 20.15 eV、12 fs 的脉冲，首次展示了 Bi2Sr2CaCu2O8+δ 反节点区域准粒子的演化，并证明在一定的通量阈值以上，非单调弛豫动力学占主导地位。动力学受到电子-声子相互作用的瞬态修饰和相空间限制的强烈影响，这与节点和非节点区域的单调弛豫形成鲜明对比。
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